A permeable concrete pavement and its construction method

Abstract

The present application discloses a permeable concrete pavement and its construction method, which relates to the field of road construction technology. The permeable concrete pavement includes a plain soil base layer, a sand and gravel layer, a lower permeable concrete layer, a permeable geotextile layer, and an upper permeable concrete layer laid in sequence from bottom to top. The permeable geotextile layer is laid on the upper surface of the lower permeable concrete layer, and the upper surface of the lower permeable concrete layer is gradually inclined downward from the middle to both sides along its width direction. In the present application, the permeable geotextile layer has a slope inclined towards both sides of the road, enabling rainwater to carry the solid substances on the surface of the permeable geotextile layer to both sides of the road structure, reducing the solid substances accumulated on the surface of the permeable geotextile layer, and thus facilitating the permeable geotextile to maintain a high permeable efficiency for a longer time.

Description

Technical Field

[0001] This application relates to the field of road construction technology, and particularly relates to a permeable concrete pavement and a construction method thereof. Background Technique

[0002] Recycled aggregate permeable concrete refers to the recycled aggregate permeable concrete with a high void ratio made by replacing part or all of the natural coarse aggregate, water, cement, admixture, and admixture. The application of recycled aggregate permeable concrete can promote the realization of the concept of "sponge city". Permeable concrete has stronger water permeability than ordinary concrete due to the large number of pores inside it, and the reduction of permeability caused by blockage is the most important problem faced by porous permeable concrete. Solid substances (such as fine sand, organic fine particles, etc.) suspended in rainwater runoff will enter the permeable pores, resulting in pore blockage and gradually reducing permeability, making it difficult for the permeable concrete pavement to maintain high-efficiency water permeability function for a long time.

[0003] In the related technology, a permeable geotextile is arranged in the permeable concrete pavement structure to filter the solid substances in the rainwater and reduce the entry of solid substances suspended in the rainwater into the permeable concrete pores. However, as the service time of the road surface increases, solid substances gradually accumulate on the surface of the permeable geotextile to form an accumulation layer, affecting the water permeability efficiency of the permeable geotextile. Summary of the Invention

[0004] In order to reduce the problem that the accumulation of solid substances on the surface of the permeable geotextile used for water permeability in the permeable pavement structure affects the water permeability efficiency of the permeable geotextile, this application provides a permeable concrete pavement and a construction method thereof.

[0005] A permeable concrete pavement and a construction method thereof provided by this application adopt the following technical solutions:

[0006] A permeable concrete pavement includes a plain soil base layer, a sand and gravel layer, a lower permeable concrete layer, a permeable geotextile layer, and an upper permeable concrete layer laid in sequence from bottom to top; the permeable geotextile layer is laid on the upper surface of the lower permeable concrete layer, and the upper surface of the lower permeable concrete layer is gradually inclined downward from the middle to both sides along its own width direction.

[0007] By adopting the above technical solution, on rainy days, rainwater from the permeable concrete pavement enters the gravel layer through the upper permeable concrete layer, the permeable geotextile layer, and the lower permeable concrete layer. As the rainwater passes through the permeable geotextile layer, the permeable geotextile layer intercepts solid matter in the rainwater. The permeable geotextile is laid on the upper surface of the lower permeable concrete layer, and the upper surface of the lower permeable concrete layer has a downward slope from the center to the sides, giving the permeable geotextile layer a slope inclined toward the sides of the road. When rainwater flows through the permeable geotextile layer, in addition to the rainwater that passes through the permeable geotextile layer, some rainwater also flows along the surface of the permeable geotextile layer toward the sides of the pavement structure. This rainwater can carry solid matter on the surface of the permeable geotextile layer to the sides of the pavement structure, reducing the accumulation of solid matter on the surface of the permeable geotextile layer, thereby helping the permeable geotextile maintain its high permeability efficiency for a longer period of time.

[0008] Optionally, the permeable geotextile layer includes two groups of permeable geotextiles, which are arranged side by side along the width direction of the lower permeable concrete layer, with a spacing margin left between the two groups of permeable geotextiles; an auxiliary permeable layer is buried in the upper permeable concrete layer, and the projection of the auxiliary permeable layer on the surface of the permeable geotextile layer covers the gap between the two groups of permeable geotextiles.

[0009] By adopting the above technical solution, rainwater flowing from the upper permeable concrete layer to the lower permeable concrete layer generally flows from top to bottom. However, as solid matter accumulates on the surface of the permeable geotextile layer and the auxiliary permeable layer, the permeability efficiency of the permeable geotextile layer and the auxiliary permeable layer decreases, causing more rainwater to be retained in the upper permeable concrete layer. By reserving a spacing margin between the two sets of permeable geotextiles, rainwater retained in the upper permeable concrete layer can directly enter the lower permeable concrete layer through the area between the two sets of permeable geotextiles, thereby reducing the problem of poor road drainage. In addition, by providing an auxiliary permeable layer above the gap between the two sets of permeable geotextiles, rainwater flowing from top to bottom is filtered by the auxiliary permeable layer before flowing into the lower permeable concrete layer, minimizing the amount of solid matter entering the lower permeable concrete layer.

[0010] Optionally, opposite sides of the two groups of permeable geotextiles are folded upward to form folded portions.

[0011] By adopting the above technical solution, when the rainwater retained above the permeable geotextile layer flows into the gap between the two groups of permeable geotextiles, the flowing rainwater has a driving effect on the solid matter accumulated on the surface of the permeable geotextile layer. By providing folding parts on the opposite sides of the two groups of permeable geotextiles, the folding parts can form an interception effect on the solid matter accumulated on the surface of the permeable geotextile, which is beneficial to reduce the solid matter accumulated on the surface of the permeable geotextile from entering the lower permeable concrete layer.

[0012] Optionally, partition strips are provided on the upper surfaces of the two groups of permeable geotextiles. The length direction of the partition strips is arranged along the length direction of the permeable geotextile layer, and the partition strips are located below the corresponding folding parts.

[0013] By adopting the above technical solution, the partition strips are located between the folding parts and the upper surfaces of the permeable geotextiles. The partition strips raise the folding parts, enabling the folding parts to intercept as much solid matter accumulated on the surfaces of the permeable geotextiles as possible.

[0014] Optionally, blocking members are respectively arranged on the opposite sides of the two groups of the permeable geotextiles. The blocking members are located on the upper surfaces of the permeable geotextiles. The blocking members are arranged along the entire length of the permeable geotextiles in the length direction. The blocking members are embedded in the upper permeable concrete layer, and there is a spacing margin between the upper edges of the blocking members and the auxiliary permeable layer.

[0015] By adopting the above technical solution, when the rainwater retained in the lower permeable concrete layer flows towards the gap between the two groups of permeable geotextiles, it is blocked by the blocking members. The blocking members force the rainwater to flow from the gap between the blocking members and the auxiliary permeable layer towards the gap between the two groups of permeable geotextiles. During this process, the solid matter in the rainwater is blocked by the blocking members, so that the speed of the solid matter is reduced and then it settles, which is beneficial to reducing the entry of the solid matter in the rainwater into the gravel layer through the gap between the two groups of permeable geotextiles.

[0016] Optionally, the blocking member includes a blocking main body member. The blocking main body member includes a supporting bottom plate portion and a blocking vertical plate portion. The bottom surface of the supporting bottom plate portion abuts against the upper surface of the permeable geotextile. The blocking vertical plate portion is a metal grid member, and a filter layer is laid on the side surface of the blocking vertical plate portion.

[0017] By adopting the above technical solution, when the rainwater retained in the lower permeable concrete layer flows towards the gap between the two groups of permeable geotextiles, it is blocked by the blocking members. The blocking vertical plate portion has grids, enabling the water flow to easily pass through the blocking vertical plate portion. The filter layer located on the blocking vertical plate portion can play a filtering role for the water flow, and the filtering surface of the filter layer is vertically arranged, making it difficult for solid matter to adhere, so that the filter layer can maintain a good water permeable effect.

[0018] Optionally, the parts on the opposite sides of the two groups of the permeable geotextiles are turned up to form the filter layer.

[0019] By adopting the above technical solution, the filter layer is formed by turning up the permeable geotextile parts, and the construction is relatively convenient.

[0020] Optionally, the blocking vertical plate portion is inclined, and the included angle between the blocking vertical plate portion and the supporting bottom plate portion is an acute angle and faces away from the center of the upper permeable concrete layer.

[0021] By adopting the above technical solution, the included angle between the blocking vertical plate part and the supporting bottom plate part is set as an acute angle. Compared with the vertical setting method, the center of gravity of the blocking vertical plate part can be closer to the central part of the supporting bottom plate part, which is beneficial to improving the stability of the blocking main body. In addition, the included angle between the blocking vertical plate part and the supporting bottom plate part plays a guiding role for the water flow, making the side where the filter layer inclines downward be the inflow direction of the water flow. Solid substances usually hardly adhere to the surface that inclines downward, while the surface where the filter layer inclines upward is the side where the water flow flows out, and the water flow has a scouring effect on the solid substances adhering to the surface where the filter layer inclines upward, which is beneficial to minimizing the solid substances attached to the filter layer as much as possible.

[0022] Optionally, a permeable geotextile cushion layer is provided between the lower permeable concrete layer and the gravel layer.

[0023] By adopting the above technical solution, when there is a break and leakage of an underground pipeline in the area near the permeable concrete road surface, the permeable geotextile cushion layer can prevent the upward-leaking water flow from bringing the underground soil into the lower permeable concrete layer.

[0024] A construction method of a permeable concrete road surface includes the following steps:

[0025] The step of laying the gravel layer;

[0026] The construction step of the lower permeable concrete layer, and the upper surface of the lower permeable concrete is trimmed into a shape that gradually slopes downward from the middle to both sides;

[0027] The step of laying the permeable geotextile;

[0028] The construction step of the upper permeable concrete layer.

[0029] In summary, the present application includes at least one of the following beneficial technical effects:

[0030] 1. When rainwater flows through the permeable geotextile layer, in addition to the rainwater that permeates through the permeable geotextile layer, part of the rainwater flows obliquely along the surface of the permeable geotextile layer to both sides of the road surface structure, enabling the rainwater to carry the solid substances on the surface of the permeable geotextile layer to both sides of the road surface structure, reducing the solid substances accumulated on the surface of the permeable geotextile layer, and thus being beneficial to keeping the permeable geotextile in a highly efficient permeable efficiency for a longer time;

[0031] 2. By reserving a spacing allowance between two groups of permeable geotextiles, the rainwater retained in the upper permeable concrete layer can directly enter the lower permeable concrete layer through the area between the two groups of permeable geotextiles to reduce the situation of poor road surface drainage. By providing an auxiliary permeable layer above the gap between the two groups of permeable geotextiles, the rainwater flowing from top to bottom is filtered by the auxiliary permeable layer and then flows into the lower permeable concrete layer to minimize the solid substances entering the lower permeable concrete layer. Description of the Drawings

[0032] Figure 1 is a schematic structural view of the permeable concrete pavement of Embodiment 1.

[0033] Figure 2 is Figure 1 a partial enlarged view of the position A in

[0034] Figure 3 is a schematic structural view of the permeable concrete pavement of Embodiment 2.

[0035] Figure 4 is Figure 3 a partial enlarged view of the position B in

[0036] Figure 5 is a schematic structural view of the blocking member of Embodiment 2.

[0037] Description of the Reference Numerals:

[0038] 1, subgrade of plain soil; 2, gravel layer; 3, permeable geotextile cushion layer; 4, lower permeable concrete layer; 5, permeable geotextile layer; 51, permeable geotextile; 511, folding part; 52, blank area; 6, upper permeable concrete layer; 61, auxiliary permeable layer; 7, partition strip; 8, blocking member; 81, blocking main body member; 811, supporting bottom plate part; 812, blocking vertical plate part; 82, filter layer; 9, clip. Detailed Description of the Embodiments

[0039] The following further elaborates on the present application in conjunction with the attached Figures 1-5 drawings.

[0040] Embodiment 1

[0041] The embodiment of the present application discloses a permeable concrete pavement. Referring to Figure 1 , the permeable concrete pavement and its construction method include a subgrade of plain soil 1, a gravel layer 2, a permeable geotextile cushion layer 3, a lower permeable concrete layer 4, a permeable geotextile layer 5, and an upper permeable concrete layer 6 laid in sequence from bottom to top; the material of the gravel layer 2 is recycled graded gravel, the material of the upper permeable concrete layer 6 uses strong and dense permeable concrete with hard texture, and the material of the lower permeable concrete layer uses recycled aggregate concrete.

[0042] During rainfall, rainwater flows from the upper permeable concrete layer 6 through the permeable geotextile layer 5 into the lower permeable concrete layer 4. The permeable geotextile layer 5 has an interception effect on the dust particles carried in the rainwater, which is beneficial to reducing the filling of the pores of the lower permeable concrete layer 4 with solid substances such as dust, so that the lower concrete layer can maintain high permeable performance. The purpose of setting the permeable geotextile cushion layer 3 is to prevent the upward leakage of water due to the breakage of buried pipes from bringing soil particles into the lower concrete layer.

[0043] Reference Figure 1 As shown in Figure 1 , the upper surface of the lower permeable concrete layer 4 is gradually inclined downward from the middle to both sides along its width direction. The permeable geotextile layer 5 is laid on the upper surface of the lower permeable concrete layer 4. When rainwater passes through the permeable geotextile layer 5, in addition to the part that penetrates through the permeable geotextile layer 5, part of the rainwater flows obliquely to both sides of the road structure along the surface of the permeable geotextile layer 5. The rainwater flowing along the surface of the permeable geotextile 51 can carry the solid substances accumulated on the surface of the permeable geotextile layer 5 to both sides of the road structure, reducing the situation where the accumulation of solid substances affects the water permeability efficiency of the permeable geotextile 51.

[0044] Reference Figure 1 As shown in Figure 1 , the permeable geotextile layer 5 includes two groups of permeable geotextiles 51. The two groups of permeable geotextiles 51 are arranged side by side along the width direction of the lower permeable concrete layer 4. A spacing allowance is left between the two groups of permeable geotextiles 51, forming a blank area 52 without laid geotextiles between the two groups of permeable geotextiles 51. The rainwater in the upper permeable concrete layer 6 can directly flow into the lower permeable concrete layer 4 through the blank area 52. The permeable geotextiles 51 in the same group are laid in an overlapping manner when laid.

[0045] Reference Figure 1 As shown in Figure 1 , an auxiliary permeable layer 61 is buried in the upper permeable concrete layer 6. The material of the auxiliary permeable layer 61 is the permeable geotextile 51. The upper permeable concrete layer ⑥ is laid in layers. The auxiliary permeable layer 61 is laid between different layers of the upper permeable layer. The projection of the auxiliary permeable layer 61 on the surface of the permeable geotextile layer 5 covers the blank area 52 between the two groups of permeable geotextiles 51.

[0046] When the water permeability performance of the auxiliary permeable layer 61 and the permeable geotextile layer 5 decreases due to the accumulation of solid substances, resulting in rainwater staying in the upper permeable concrete layer 6, the rainwater staying in the upper permeable concrete layer 6 can directly enter the lower permeable concrete layer 4 through the blank area 52 between the two groups of permeable geotextiles 51 to promote the water permeability of the road surface. In addition, the auxiliary permeable layer 61 located above the blank area of the permeable geotextile layer 5 can filter the rainwater flowing from top to bottom to minimize the solid substances entering the lower permeable concrete layer 4.

[0047] Reference Figure 2 As shown in Figure 2 , folding parts 511 are formed by folding both opposite sides of the two groups of permeable geotextiles 51 upward, making it difficult for the solid substances accumulated on the surface of the permeable geotextile layer 5 to enter the blank area 52 of the permeable geotextile layer 5 under the drive of water flow.

[0048] The upper surfaces of both sets of permeable geotextiles 51 are provided with spacers 7. The spacers 7 can be made of flat steel, which has a high density and can press down on the edges of the permeable geotextiles 51. The spacers 7 are arranged along the length of the permeable geotextile layer 5. The spacers 7 are positioned corresponding to the folds 511 of the permeable geotextile 51, and are located below the corresponding folds 511. The spacers 7 can raise the folds 511, making it more difficult for solid matter accumulated on the surface of the permeable geotextile to enter the blank areas 52 of the permeable geotextile layer 5.

[0049] This embodiment also discloses a construction method of a permeable concrete pavement, comprising the following steps:

[0050] Step 1: Construction preparation: equip the construction site with the necessary materials and equipment and take safety precautions;

[0051] Step 2: Blind pipe laying step: after the road trench reaches the design elevation, the soil base 1 is leveled and compacted, and blind pipes are laid on the surface of the soil base 1. The blind pipes are connected to municipal drainage facilities or natural water bodies;

[0052] Step 3: laying the gravel layer 2, laying the regenerated graded gravel on top of the plain soil base 1, so that the blind pipe is buried in the gravel layer 2;

[0053] Step 4: Construction step of the lower permeable concrete layer 4. After the lower permeable concrete layer 4 is laid, the upper surface is trimmed into a shape that gradually slopes downward from the middle to both sides;

[0054] Step 5: laying of the permeable geotextile layer 5;

[0055] Step 6: Construction steps of permeable concrete layer 6.

[0056] The principles of the permeable concrete pavement and its construction method according to the present invention are as follows: During rainy days, rainwater flows through the upper permeable concrete layer 6, the permeable geotextile layer 5, the lower permeable concrete layer 4, and the anti-return geotextile layer into the gravel layer 2. The permeable geotextile layer 5 intercepts solid matter in the rainwater. As the rainwater passes through the permeable geotextile layer 5, in addition to the rainwater that permeates the permeable geotextile layer 5, some of the rainwater flows obliquely along the surface of the permeable geotextile layer 5 toward the sides of the pavement structure, carrying solid matter from the surface of the permeable geotextile 51 to the sides of the pavement structure.

[0057] Example 2

[0058] The difference between this embodiment and embodiment 1 is that the two groups of permeable geotextiles 51 of this embodiment are not provided with the folding portion 511 and the spacer 7 corresponding to the folding portion 511 .

[0059] Reference Figure 3In this embodiment, blocking members 8 are respectively provided on opposite sides of the two groups of permeable geotextiles 51. The blocking members 8 are located on the upper surface of the permeable geotextile 51. The blocking members 8 are arranged along the entire length of the permeable geotextile 51. The permeable concrete layer 6 is on the blocking members 8. A spacing margin is left between the upper edge of the blocking members 8 and the auxiliary permeable layer 61.

[0060] Reference Figure 4 The barrier member 8 includes a main barrier member 81, which is a metal mesh member. Specifically, the barrier member 8 is a long strip of steel mesh. The main barrier member 81 includes a support base 811 and a vertical barrier member 812. The support base 811 and the vertical barrier member 812 are formed by bending the steel mesh. The bottom surface of the support base 811 abuts the upper surface of the permeable geotextile 51. The vertical barrier member 812 is inclined. The angle between the vertical barrier member 812 and the support base 811 is acute. The vertical barrier member 812 faces away from the center of the permeable concrete layer 6, so that the center of gravity of the vertical barrier member 812 is closer to the center of the support base 811, thereby making the main barrier member 81 more stable when placed.

[0061] Reference Figure 4 and Figure 5 The side of the blocking plate portion 812 is paved with a filter layer 82. The filter layer 82 corresponding to the two blocking main body parts 81 is formed by folding upward the parts on the opposite sides of the two groups of permeable geotextiles 51, and the upper edge of the upwardly flipped part of the permeable geotextile 51 is overlapped with the upper edge of the blocking plate portion 812. The blocking plate portion 812 and the part of the permeable geotextile 51 serving as the filter layer 82 are clamped and connected by a clip 9. The clip 9 is an integrated plastic clip or metal clip. The plastic clip 9 and the metal clip 9 can use purchased standard parts.

[0062] The implementation principle of this embodiment is: when the rainwater retained in the upper permeable concrete layer 6 flows to the blank area 52 of the permeable geotextile layer 5, it is blocked by the blocking member 8. During this process, the part of the waterproof geotextile used as the filter layer 82 can intercept the solid matter in the rainwater, and the speed of the solid matter is reduced and then settled. In addition, since the filter surface of the filter layer 82 of the blocking member 8 is arranged upright, solid matter is not easy to adhere, and the filter layer 82 can maintain good water permeability.

[0063] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A permeable concrete pavement, characterized in that: It includes a plain soil base layer (1), a sand and gravel layer (2), a lower permeable concrete layer (4), a permeable geotextile layer (5), and an upper permeable concrete layer (6) laid successively from bottom to top; the permeable geotextile layer (5) is laid on the upper surface of the lower permeable concrete layer (4), and the upper surface of the lower permeable concrete layer (4) is gradually inclined downward from the middle to both sides along its width direction. The permeable geotextile layer (5) includes two groups of permeable geotextiles (51), which are arranged side by side along the width direction of the lower permeable concrete layer (4) between the two groups of permeable geotextiles (51), and there is a spacing allowance; an auxiliary permeable layer (61) is buried in the upper permeable concrete layer (6), and the projection of the auxiliary permeable layer (61) on the surface of the permeable geotextile layer (5) covers the gap between the two groups of permeable geotextiles (51).

2. The permeable concrete pavement according to claim 1, wherein: Folding parts (511) are formed by folding the opposite sides of the two groups of permeable geotextiles (51) upward.

3. The permeable concrete pavement according to claim 2, characterized in that: Partition strips (7) are provided on the upper surfaces of the two groups of permeable geotextiles (51), the length direction of the partition strips (7) is arranged along the length direction of the permeable geotextile layer (5), and the partition strips (7) are located below the corresponding folding parts (511).

4. A permeable concrete pavement according to claim 1, characterized in that: Blocking members (8) are respectively arranged on the opposite sides of the two groups of permeable geotextiles (51), the blocking members (8) are located on the upper surface of the permeable geotextile (51), the blocking members (8) are arranged along the entire length of the permeable geotextile (51) in the length direction, the blocking members (8) are buried in the upper permeable concrete layer (6), and there is a spacing allowance between the upper edge of the blocking members (8) and the auxiliary permeable layer (61).

5. The permeable concrete pavement according to claim 4, characterized in that: The blocking member (8) includes a blocking main body member (81), the blocking main body member (81) includes a support bottom plate portion (811) and a blocking vertical plate portion (812), the bottom surface of the support bottom plate portion (811) abuts against the upper surface of the permeable geotextile (51), the blocking vertical plate portion (812) is a metal mesh member, and a filter layer (82) is laid on the side surface of the blocking vertical plate portion (812).

6. The permeable concrete pavement according to claim 5, characterized in that: The filter layer (82) is formed by turning up the parts on the opposite sides of the two groups of permeable geotextiles (51).

7. A permeable concrete pavement according to claim 6, characterized in that: The blocking vertical plate portion (812) is inclined, the included angle between the blocking vertical plate portion (812) and the support bottom plate portion (811) is an acute angle, and it is away from the center of the upper permeable concrete layer (6).

8. A permeable concrete pavement according to claim 1, characterized in that: A permeable geotextile cushion layer (3) is provided between the lower permeable concrete layer (4) and the sand and gravel layer (2).

9. A construction method of a permeable concrete pavement according to any one of claims 1-7, characterized in that: It includes the following steps: Step of laying the sand and gravel layer (2); Step of constructing recycled aggregate concrete, and the upper surface of the recycled aggregate concrete is trimmed into a shape that gradually inclines downward from the middle to both sides; Step of laying the permeable geotextile (51); Step of constructing the upper permeable concrete layer (6).

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